<template>
	<div class="el-tree-select">
		<el-select
			ref="treeSelect"
			v-model="valueId"
			style="width: 100%"
			:filterable="true"
			:clearable="true"
			:filter-method="selectFilterData"
			:placeholder="placeholder"
			@clear="clearHandle"
		>
			<el-option :value="valueId" :label="valueTitle">
				<el-tree
					id="tree-option"
					ref="selectTree"
					:accordion="accordion"
					:data="options"
					:props="objMap"
					:node-key="objMap.value"
					:expand-on-click-node="false"
					:default-expanded-keys="defaultExpandedKey"
					:filter-node-method="filterNode"
					@node-click="handleNodeClick"
				></el-tree>
			</el-option>
		</el-select>
	</div>
</template>

<script setup lang="tsx">
import { ref, onMounted, computed, nextTick, watch, getCurrentInstance } from 'vue';

const instance = getCurrentInstance();
const proxy = instance!.proxy;
const selectTree = ref();
const treeSelect = ref();

const props = defineProps({
	/* 配置项 */
	objMap: {
		type: Object,
		default: () => {
			return {
				value: 'id', // ID字段名
				label: 'label', // 显示名称
				children: 'children', // 子级字段名
			};
		},
	},
	/* 自动收起 */
	accordion: {
		type: Boolean,
		default: () => {
			return false;
		},
	},
	/**当前双向数据绑定的值 */
	modelValue: {
		type: [String, Number],
		default: '',
	},
	/**当前的数据 */
	options: {
		type: Array,
		default: () => [],
	},
	/**输入框内部的文字 */
	placeholder: {
		type: String,
		default: '',
	},
});

const emit = defineEmits(['update:modelValue']);

const valueId = computed({
	get: () => props.modelValue,
	set: (val) => {
		console.log('set-------', val);
		emit('update:modelValue', val);
	},
});
const valueTitle = ref('');
const defaultExpandedKey = ref<any[]>([]);

function initHandle() {
	nextTick(() => {
		const selectedValue = String(valueId.value);
		if (selectedValue !== null && typeof selectedValue !== 'undefined') {
			const node = selectTree?.value?.getNode(selectedValue);
			if (node) {
				valueTitle.value = node.data[props.objMap.label];
				selectTree?.value?.setCurrentKey(selectedValue); // 设置默认选中
				defaultExpandedKey.value = [selectedValue]; // 设置默认展开
			}
		} else {
			clearHandle();
		}
	});
}
function handleNodeClick(node: any) {
	valueTitle.value = node[props.objMap.label];
	valueId.value = node[props.objMap.value];
	defaultExpandedKey.value = [];
	treeSelect.value?.blur();
	selectFilterData('');
}
function selectFilterData(val: any) {
	selectTree.value?.filter(val);
}
function filterNode(value: any, data: any) {
	if (!value) return true;
	return data[props.objMap['label']].indexOf(value) !== -1;
}
function clearHandle() {
	valueTitle.value = '';
	valueId.value = '';
	defaultExpandedKey.value = [];
	clearSelected();
}
function clearSelected() {
	const allNode = document.querySelectorAll('#tree-option .el-tree-node');
	allNode.forEach((element) => element.classList.remove('is-current'));
}

onMounted(() => {
	initHandle();
});

watch(valueId, () => {
	initHandle();
});
</script>

<style lang="scss" scoped>
@import '@/styles/variables.module.scss';
.el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
	padding: 0;
	// background-color: #fff;
	height: auto;
}

.el-select-dropdown__item.selected {
	font-weight: normal;
}

ul li .el-tree .el-tree-node__content {
	height: auto;
	padding: 0 20px;
	box-sizing: border-box;
}

:deep(.el-tree-node__content:hover),
:deep(.el-tree-node__content:active),
:deep(.is-current > div:first-child),
:deep(.el-tree-node__content:focus) {
	// background-color: mix(#fff, $--color-primary, 90%);
	// color: $--color-primary;
	// background-color: red;
}
</style>
